Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
  • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
  • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
  • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
  • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
  • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
  • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
  • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/85—Mounting of fuel injection apparatus
  • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

• the invention relates to a fuel injector according to the preamble of the main claim.
• an electromagnetic fuel injection valve and a suitable fastening structure are known with which the requirements for the sealing effect, the thermal resistance and the pressure resistance are met for an internal combustion engine with a cylinder injection system. Particular care is taken to seal the area in the immediate vicinity of the cylinder in which the electromagnetic fuel injector is attached, as well as to an area further away.
• a first sealing section with a first sealing ring which is designed as a corrugated washer, lies at a point close to the cylinder and between the fuel injection valve and the cylinder head.
• a second sealing section with a second sealing ring which is also designed as a corrugated washer, is positioned at a location which is further away from the cylinder than the first sealing section.
• Fuel injection valves are the one
• the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the sealing ring has an externally conical profile, through which the compressive forces can be reduced during assembly of the fuel injector equipped with the sealing ring.
• the sealing ring has a radial projection over the nozzle body which increases over the axial length of the sealing ring in the outflow direction.
• the sealing ring has a circumferential groove which, in conjunction with a ring formed in the recess provided for the sealing ring, enables the sealing ring to be fixed axially.
• a cylindrical recess is formed on the inner diameter of the sealing ring in the area of the largest projection U max , which gives the sealing ring a radial elasticity, as a result of which the assembly requires considerably lower press-in forces.
• a bevel formed on the sealing ring and on the cylinder head are also advantageous, which facilitate the introduction of the fuel injector with the mounted sealing ring into a receiving bore in the cylinder head.
• Fig. 1 is a schematic section through an embodiment of a fuel injector according to the invention in an overall view
• Fig. 2 shows a schematic section in area II in Fig. 1 from the fuel injector designed according to the invention.
• a fuel injector 1 is in the form of a fuel injector for fuel injection systems of mixed compression, spark-ignited
• Fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber (not shown) of an internal combustion engine.
• the fuel injector 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
• the valve needle 3 is in operative connection with a valve closing body 4, which with one on a Valve seat body 5 arranged valve seat surface 6 cooperates to form a sealing seat.
• a valve closing body 4 which with one on a Valve seat body 5 arranged valve seat surface 6 cooperates to form a sealing seat.
• a valve closing body 4 which with one on a Valve seat body 5 arranged valve seat surface 6 cooperates to form a sealing seat.
• the fuel injection valve 1 is in the 'exemplary embodiment is an inwardly opening fuel injector 1 which has a spray-discharge opening. 7
• the nozzle body 2 ' is against one by a seal 8
• Sealing ring 34 consists of a material, preferably coated with Teflon, or directly of PTFE in order to achieve a reliable sealing effect. According to the invention, the sealing ring 34 has a conically profiled cross-section, as a result of which a rising above the nozzle body 2
• Projection 35 of the sealing ring 34 varies over its axial length. A detailed illustration of the sealing ring 34 can be found in the description of FIG. 2.
• the magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12, which bears against an inner pole 13 of the magnet coil 10.
• the inner pole 13 and the outer pole 9 are separated from one another by a gap 26 and are supported on a connecting component 29.
• the magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17.
• the plug contact 17 is surrounded by a plastic coating 18, which can be molded onto the inner pole 13.
• valve needle 3 is guided in a valve needle guide 14, which is disc-shaped.
• a paired adjusting disk 15 is used for stroke adjustment.
• An armature 20 is located on the other side of the adjusting disk 15. This armature is non-positively connected to the valve needle 3 via a first flange 21, which is connected to the first flange 21 by a weld seam 22.
• a return spring 23 is supported, which in the present design of the Fuel injector 1 is biased by a sleeve 24.
• a second flange 31 is arranged on the outflow side of the armature 20 and serves as a lower armature stop. It is non-positively connected to the valve needle 3 via a weld seam 33.
• An elastic intermediate ring 32 is arranged between the armature 20 and the second flange 31 for damping armature bumpers when the fuel injector 1 closes.
• Fuel channels 30a to 30c run in the valve needle guide 14, in the armature 20 and on the valve seat body 5.
• the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
• the fuel injector 1 is sealed by a seal 28 against a distribution line, not shown.
• the first flange 21 on the valve needle 3 is acted upon by the return spring 23 against its lifting direction in such a way that the valve closing body 4 on the valve seat 6 is held in sealing contact.
• the armature 20 rests on the intermediate ring 32, which is supported on the second flange 31.
• the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field which moves the armature 20 in the stroke direction against the spring force of the return spring 23.
• the armature 20 takes the first flange 21, which is welded to the valve needle 3, and thus also the valve needle 3 in the lifting direction.
• the valve closing body 4, which is operatively connected to the valve needle 3, lifts off from the valve seat surface 6, as a result of which the fuel led to the spray opening 7 via the fuel channels 30a to 30c is sprayed off.
• the armature 20 drops from the inner pole 13 ′ after the magnetic field has been sufficiently reduced by the pressure of the return spring 23 on the first flange 21, as a result of which the valve needle 3 moves counter to the stroke direction. As a result, the valve closing body 4 ' on the Valve seat surface 6, and that . Fuel injector 1 is closed. The armature 20 rests on the armature stop formed by the second flange 31.
• FIG. 2 shows an excerpted sectional illustration of the section from the fuel injector 1 designed according to the invention as II in FIG. 1. Corresponding components are provided with the same reference numerals.
• the sealing ring 34 is arranged in a groove-shaped, circumferential recess 36 of the nozzle body 2.
• a ring 37 is provided, which is formed in the recess 36 of the nozzle body 2, protrudes beyond the groove base and engages in a corresponding groove 38 of the sealing ring 34.
• the sealing ring 34 is profiled conically. This means that the projection 35, which projects radially beyond the nozzle body 2, as already mentioned, varies over the axial length of the sealing ring 34.
• the protrusion 35 on an inlet end 39 of the sealing ring 34 is minimal, while the protrusion 35 on an outlet end 40 of the sealing ring 34 is maximum. This is designated in Fig. 2 with Ü m j_ n and Ü max .
• the sealing ring 34 is provided on the downstream side of the ring 37 with a cylindrical recess 41, as a result of which the sealing ring 34 is spaced from the groove base of the recess 36 in this region, so that this gives the sealing ring 34 a slight radial elasticity.
• This is one hand advantageous for those mounting of the sealing ring 34 in the recess 36 of ⁇ the nozzle body 2, since the diameter of the sealing ring is expanded in this area 34 and hence the force required to the nozzle body 2 for sliding of the sealing ring 34 is smaller. This also simplifies the insertion into the recess 36.
• the radial elasticity is advantageous for mounting the fuel injection valve 1 in a cylinder head 42 of the internal combustion engine.
• the sealing ring 34 can be radially compressed due to the cylindrical recess 41, as a result of which the area of the maximum projection 35 is compressed. This results in the fuel injector 1 being easy to insert into the cylinder head 42.
• the assembly is then at 35 having drain-side end face 40 additionally reinforced by a chamfer 43 the maximum 'overhang of the sealing ring 34, which rounds the maximum projection 35 in this area so to speak.
• a similar effect can be achieved by a corresponding chamfer 44 on an edge 45 of the receiving bore of the cylinder head 42.
• the sealing effect of the sealing ring 34 designed according to the invention is reliably possible by radial pressing. Since the combustion chamber pressure downstream of the sealing ring 34 is greater than the ambient pressure on the inlet side of the sealing ring 34, the sealing ring 34 becomes radial through the combustion chamber pressure via a gap 46 between the outlet-side end face 40 and the recess 36, which is connected to the cylindrical recess 41 Direction widened so that the sealing effect is increased during the operation of the fuel injector 1.
• the invention is not limited to the illustrated embodiment and also 'for other cross-sectional shapes of sealing rings 34, as well as for arbitrary designs of fuel injectors 1, for example for the fuel injection valves 1 with connection to a common-rail system, applicable.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Fuel-Injection Apparatus (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7677352

Family Applications (1)

Country Status (9)

Cited By (3)

Families Citing this family (13)

Citations (6)

Family Cites Families (8)

• 2001
  • 2001-03-14 DE DE10112143A patent/DE10112143A1/de not_active Withdrawn
• 2002
  • 2002-03-14 WO PCT/DE2002/000909 patent/WO2002073026A1/de active IP Right Grant
  • 2002-03-14 DE DE50209488T patent/DE50209488D1/de not_active Expired - Lifetime
  • 2002-03-14 RU RU2003129063/06A patent/RU2003129063A/ru not_active Application Discontinuation
  • 2002-03-14 JP JP2002572259A patent/JP2004518873A/ja not_active Withdrawn
  • 2002-03-14 EP EP02727225A patent/EP1381771B1/de not_active Expired - Lifetime
  • 2002-03-14 ES ES02727225T patent/ES2280534T3/es not_active Expired - Lifetime
  • 2002-03-14 US US10/275,793 patent/US6921035B2/en not_active Expired - Fee Related
  • 2002-03-14 CN CN02800626A patent/CN1459002A/zh active Pending
  • 2002-03-14 CZ CZ20023670A patent/CZ20023670A3/cs unknown

Patent Citations (6)

Non-Patent Citations (2)

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